ff2e485f2e
The existing {OwnedVector::New} value-initializes all elements, which
means zeroing them in case on integral types. In many cases though we
know that we will overwrite the content anyway, so the initialization is
redundant.
In the case of assembly buffers for wasm compilation, this zeroing
showed up with several percent of execution times for some benchmarks.
Hence this CL introduces a new {OwnedVector::NewForOverwrite} (along the
lines of {std::make_unique_for_overwrite}), which only
default-initializes the values (meaning no initialization for integral
values).
R=thibaudm@chromium.org
Bug: v8:10576
Change-Id: I8d2806088acebe8a264dea2c7ed74b0423671d4f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2237140
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68268}
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| testing | ||
| third_party | ||
| tools | ||
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| .editorconfig | ||
| .flake8 | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
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| .gn | ||
| .vpython | ||
| .ycm_extra_conf.py | ||
| AUTHORS | ||
| BUILD.gn | ||
| CODE_OF_CONDUCT.md | ||
| codereview.settings | ||
| COMMON_OWNERS | ||
| DEPS | ||
| ENG_REVIEW_OWNERS | ||
| INFRA_OWNERS | ||
| INTL_OWNERS | ||
| LICENSE | ||
| LICENSE.fdlibm | ||
| LICENSE.strongtalk | ||
| LICENSE.v8 | ||
| LICENSE.valgrind | ||
| MIPS_OWNERS | ||
| OWNERS | ||
| PPC_OWNERS | ||
| PRESUBMIT.py | ||
| README.md | ||
| S390_OWNERS | ||
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V8 JavaScript Engine
V8 is Google's open source JavaScript engine.
V8 implements ECMAScript as specified in ECMA-262.
V8 is written in C++ and is used in Google Chrome, the open source browser from Google.
V8 can run standalone, or can be embedded into any C++ application.
V8 Project page: https://v8.dev/docs
Getting the Code
Checkout depot tools, and run
fetch v8
This will checkout V8 into the directory v8 and fetch all of its dependencies.
To stay up to date, run
git pull origin
gclient sync
For fetching all branches, add the following into your remote
configuration in .git/config:
fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
fetch = +refs/tags/*:refs/tags/*
Contributing
Please follow the instructions mentioned at v8.dev/docs/contribute.